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None of the years of WRX catback will bolt right up...they will ALL be about 3" too short in the midpipe, and the flange will be rotated the wrong way. That being said, ALL of the WRX axlebacks will bolt up to the 2.5i...so if you get a WRX catback: 1) get the midpipe lengthened, and the flange rotated, and 2) bolt on the axleback....done!

If you have an STi or WRX catback you can cut the downpipe just before the second cat and your original cat pipe between the two cats. The two then line up perfectly and just need a reducer to be able to weld them together.